Manga Reader Key Correction

Swaps left and right arrow key functions on popular manga websites to better match the "right to left" format of a printed manga.

This extension swaps the left and right arrow key navigation function (i.e. left goes to the next page and right goes to the previous page) on popular manga reader websites, this is to better match the right to left reading order of conventional Japanese printed manga.
The extension currently works on the following sites:
http://www.mangasee.com/
http://www.mangareader.net/
http://www.mangahere.com/
http://www.tenmanga.com/
http://mangastream.com/
http://mangawall.com/
http://beta.mangafox.com/
http://unixmanga.com/
http://www.mangainn.com/
http://www.mangapark.com/
http://www.fakku.net/